Smoke-consumer



J. MOFFATT. SMOKE-CONSQMER. APPLICATION FILED AUG.12,19I8.

Patented Mar. 9 1920.

M VAWTM y- 0 MO/MZ JoHN' orFAT. or 'ronon'ro, on'rliuuo, CANADA."

' sMpKn-coNsUriER. v

Specification of Letters latent. Patented Blur. 9, 1920.

Application filed August 12, 1918. Serial No. 2.49.539.

To all whomeit may concern Be it known .that'I, JOHN M F-FAT, of

the city ofToronto, in the county of York,- n the Province of Ontario,, Canada, have inv'ented certain new and useful Improvesmoke consumers. application for which was i E .filed in the United States Pat'entlOfiice unfollowing isthe specification.

My lnventlon relates to improvements .in

ments'in Smoke-Consumers, of which the .der Serial No. 203,917 on the 26th November, 1917, and the object of'the present in vention is to increase the-calorific value of the products of combustion immediately prior to their passage through the fiues of the boiler. My invention consists of a chamber 10- i cated in the'back' wall of the furnace and exterior of the furnace, 1 the end of the spiral being provided with a conduit lead-.-

provided with a spiral passage-way into. the cente-rof which extends a conduit from the ing into the interior of the furnace at a point where the products of combustion turn and pass upwardly into the fines of the boiler, the air being arranged to pass into through'the tubes of the the rear of the furnace space, and-the parts being otherwise arranged and constructed in detail as hereinafter more particularly explained.

Figure 1, is a sectional view showing the device when applied to a furnace of my type. v p

' Fig. 2, is a perspective detail showing 'the form of the spiral chamber and the conduit leading into the center thereof.

Fig. 3, is a detail of the cover plate for the chamber showing the conduit, which leadsinto the furnace itself.

In the drawings like'characters of reference indicate corresponding parts in the various figures. 4

- 1 indicates a portion of a furnace having a boiler 2 and a bridge 'wall' .3 between the combustion chambers 4: and 5-tl1e same as 1 in my former application above referred to. 6 is the rear wall of the furn'aceand- 7 1s the space leading to a point at the back of the boiler.- The products of combustion.

pass through the combustion chambers- 1 and-5 and up through the portion '7 back in the drawing.

through the conduit 14: into the furnace. general arrangement and construction of my.

boiler as indicated 'In the rear wall 6 I place my device for increasing the calorific Nalue of the prod-- nets of combustion. This device consists of. a casing 8 provided with a spiral passageway 9 formed by the spiral rib 10; The splral passage-way at the. center terminates in a chamber 11 from which extends the conduit 12 at the outer end of which is located the slide damper 13.

The casing 8 is providqd with a cover 8" having a conduit 11 preferably inc-lined and leading into the chamber 5 at the lower end ofv the-upper portion 7 thereof. The cover plate 8' is secured to the casing by means of the lugs 8 and Si through which the bolts 8 extend. The casing 8 is shown 10- cated in the wall 6 and the conduit 14 en- 1 ters the furnace chamber 5 as indicated. The slide damper 13 is located outside of the furnace. 0 p I By adjusting the slide damper the amount o.fair admitted into the may be regulated. 'The amount of .adjustment will depend on the nature of the .fire;

which is passing through the combustion chamber 5. The-air that is admitted through thec'onduit 12 passes to the centralportion ofthe casing 8 and then passes around the spiral to the wall 8 "at which point it passes p ace chamber 5 As the wall of the'furnace is always warm the fresh air which passes through the conduit 12.,andthe casing 8 and the conduit 14 will have imparted to it a maximum amopnt of heat before it reaches the furnace and such freshair mixing with the products of well asalso have a tendency to further .re- 1 duce the amount of smoke produced in the furnace, and thereby eliminate to a great extent the smoke nuisance. lVhat I claim .as my invention is the smoke chamber-having the usual back wall, of-a casing embedded in the Wall below theflue level and having aspiralpas sage-Way. formed therein parallel tothe inner face of the'wall andin proximity there- 1 I to, a duct extending from the outer face. of

the wall to'the central inner end-of'the pas- 10c Ina boiler furnaceythe combination with duct leading from the outer end of the silge-way, a valve at the outer end of the combustion below andbefore they reach the duct for controlling the air supply, and a flue. i spiral passage-Way at the perimeter of the 7 JOHN MOI FAIL casing through the back Wall of the smoke Witnesses: chamber and inclined downwardly so as-to B. BOYD, direct the heated air into the products of N. CARTER. 

